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But how can Sierra know if someone else is using the key ?
i haven't been online with thew game..
I can't get into the game at all ..
I can always use a cracked serial from astalavista or something, but that won't help me into multiplayer. So that's why I bought the game. To get my own key.

Try uninstalling..delete the Sierra folder and remove all registry entries for sierra & half-life, (as long as you don't have any other Sierra games). Then reinstall and try it again. If you still have the same fault your only option is to take that one back to the store for a refund / exchange or contact Sierra direct for a replacement.

I entered all the dashes , tried to enter the key in every possible and inpossible way yes.
This must be one of the most irritating thing that has happened to me when it comes to my computer . I spend 2hours locating the game, cause they where all sold out, and now the sierra support line in europe is closed for the weekend.